Fire-bar for furnaces.



W. G. URQ'STHWAITE. PIRE BAR FOR FURNAGBS. APPLICATION FILED JAN. 2'1, 1908.

- PatenteaMajfv, 1912;

UNITED sTATEs PATENT oEEioE.I

WALTER GEORGE CROSTHWAITE, 0F LEEDS, ENGLAND, ASSIGNOR TO DANIEL B. STREET, 0F WASHINGTON, lDISTRICT 0F COLUMBIA.

FIRE-BAR FOR FURNACES.

To all whom it may concern Be it known that I, WALTER GEORGE CnosTHwAITE, a subject of the King of Great Britain and Ireland, residing at York Street Mills, Leeds, in the county of York and Kingdom of England, have invented new and useful Improvements in Fire-Bars for Furnaces, of which the following is a specification.

This invention has reference to improvements in the firebars for furnaces constructed in accordance with the specification of United States Letters Patent originally granted to Thomas lVesterby and Walter George Crosthwaite under No. 693,634, dated 18th February 1902, and reissued on May 23rd 1905 to Walter George Crosthwaite, surviving inventor, and the Crost-hwaite Fire Bar Syndicate, Limited, of Leeds, England, assignee, by mesne assignments, of Thomas VVesterby, deceased, and the saidWalter George Crosthwaite, under No. 12,351. In said patent, the irebars are arranged transversely in the furnace and each bar is provided with two sets of air holes orconduits. Thebars are arranged to interlock together for forming the said air holes which run longitudinally from the front of the furnace to the bridge at its rear end. One set of air holes supplies air to or beyond the bridge. The other set of air holes communicates with fan tail openings for conveying the air passing through the said holes to the upper surface of the firebars and through the burning fuel. The said fantail openings in the herein before mentioned specification are described as being formed partly in one rebar and partly in a second contiguous rebar so that when the two firebars are placed longitudinally together, a complete fantail opening is formed. Further, in the aforesaid patent means are described for using a longitudinal semi-circular trough in place of the means employed for interlocking the bars together and for preventing the escape of air to the ash pit.

Now the object of this invention is to provide means whereby the fantail openings are each formed wholly in one firebar, instead of in the two bars as described in the said patent, and further each firebar may be arranged, if so desired, to be formed in two longitudinal portions.

In the drawings hereunto annexed Figure 1 is a front elevation of a frebar con- Speccaton of Letters Patent.

Application filed January 21, 1908.

Patented May 7 1912.

Serial No. 411,946,

structed according to this invention. Fig. 2, a transverse section of a plurality of rebars on the line 2-2 of Fig. 1. Fig. 3, a similar View on the line 3 3 Fig. 1. Fig. 4L, a transverse section of a plurality of rebars on line 4 4, Fig. 1. Fig. 5, a transverse section of a plurality of rebars showing a modied construction'. Fig. 6, a plan of a group of frebars, one of these irebars being separated from said group.

Like parts in all the views are marked with similar letters of reference.

A are the firebars which are of a similar outer contour to those described and illustrated in the hereinbefore mentioned patent. The firebars A may or may not be provided with feet A1. Each firebar is provided with a number of holes or conduits which pass transversely through the lirebar for forming, when a number of such bars are placed together,-side by side,-the two sets of holes B, B, C, C. Through the holes B, B, C, C, air or air and steam may be forced. The bar is also provided with a number, three (more or less) of semi-circular recesses D alternately arranged in its sides into which fit similarly arranged projections E formed on a second bar, which interengage and form transverse air conduits when the firebars are placed longitudinally together. The recesses F and projections G may be either circular 0r other approved form. In all cases when a semi-circular recess and projection is used it is arranged at the lower portion of the air hole or conduit for preventing any escape of air into the ash pit.

The above described parts are of a similar construction to those described and illustrated in the hereinbefore mentioned patent. Instead of forming the fantail openings H which are at a right angle to and communicate with one set of holes B, B, partly in each of two of the rebars as described and shown in the said prior patent, in the present invention one or more fantail openings H is or are formed wholly or completely in one and the same bar. That is to say, each fantail or fan shaped opening H is in the form of a recess, formed, say, wholly in one face or side of each iirebar as shown at Figs. 2 and 3. Or when more than one fantail opening H is formed in a irebar they are preferably arranged alternately on opposite sides. Each fantail or fan shaped recess H flares upwardly, as shown in Fig. 1, but the width of said opening is greatest transversely at its bottoni, or at its point of comniunication with the hole B, as shown in Figs. Q, 1t and 5. Under this construction the recesses H are long and narrow at the top a of the lirebar, and shorter longitudinally and wider transversely of said bar at their point of communication with the holes B, B. The recess H,-with the exception of being formed wholly in a single tirebar, instead ot in two such bars-is of a siinilar shape and performs the saine functions as the fan shaped openings described in the said prior patent. The part of a iirebar which abuts against the side of one in which are fantail recesses is provided with a plain flat surface that torins the second longitudinal side or portions for closing or covering the open side of each l'antail opening H. It inay also be recessed at D and F, as at Figs. 3 and 4, to receive the semi-circular or circular projections E and G for interlocking purposes. In soine cases, as in Figs. l, 2, 3 and 4, the recesses D, F, are -formeel in the saine side as the fantail recesses H. In other cases, as in Fig. 5, the said openings are formed in the opposite side ot the lirebar to the recess H.

Then desired, the lirebar B is divided longitudinally7 into two parts-that is to say, into an upper portion l and a lower portion 2, at or about, or a little above the axes of the openings B. The upper portion l of each irebar is arranged to rest upon the lower portion 2, as at Fig. 5. The two portions ot each lirebar may, or may not, be bolted or otherwise fastened together.

I claim:

l. A firebar provided with transverse openings therethrough to torni uninterrupted air passages when a series of said irebars are associated to form a grate, other openings alternating with said transverse openings in the iirebar connected each with a fan shaped air duct leading upwardly to the top of said irebar and successively disposed on opposite sides of the firebar, said tan-shaped air duct being' recessed wholly in one side of the firebar, the side opposite said recess being a plane surface, and flanges projecting troni alternate sides of the irebar and partly encircling the under halt' of the transverse openings, the side of the bar opposite said flanges having recesses therein of siinilar shape.

2. A Iirebar provided with transverse openings therethrough to forni uninterrupted air passages when a series of said lirebars are associated to forin a grate, other openings alternating with said transverse openings in the lirebar connected each with a fanshaped air duct leading upwardly to the top of said lirebar and successively disposed on opposite sides of the lirehar, said lirebar being formed of two sections separable in a plane parallel to the upper surface of the lirebar and approximately through the axes of the transverse openings connected to the tan shaped air duct, said fan shaped air duct being recessed wholly in one side olf the tirebar, the side opposite said recess being a plane surface, and flanges projecting from the under section of the lirebar encircling on one side thereof the depressions forming the lower portions of the transverse openings, the side of the bar opposite said flanges having recesses therein of siinilar shape.

WALTER GEORGE CROSTHWAITE.

lvitnesses W. FAIRBUnN-IAIART, WILLIAM SADLER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

